We have a new developer on our team. He is smart. He has a PhD in computer science. But there were some concepts he was not getting. So I had to break it down for him.
There is a text file that contains the source code for an Oracle PL/SQL package. You need to log in as the schema owner. Then you can compile the source code into the database. Once that is done, there is no relation between the source code file and the stored procedure in the database. The code gets stored within the database at compile time.
My peer thought that he could somehow step through the source code file on the hard drive. That's not how you do thing. I recommended he just add some logging to his new functions. He later came back saying he encountered problems. It did not take long to diagnose the problem.
I mentioned earlier that the source code upon compilation generates a package in the schema of the user logged in during compilation. We have users which access tables and packages in the main schema by use of synonyms. However you need to log in as the schema owner to modify that package. The code is not written to explicitly reference the schema owner. I have been doing these things for a long time and take them all for granted. Sometimes you need to step back and understand another person's perspective to help them see the light.
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